Armchair



FIG. 1 is a perspective view of the armchair;

FIG. 2 is a front view of the armchair;

FIG. 3 is a rear view of the armchair;

FIG. 4 is a top view of the armchair;

FIG. 5 is a left side view of the armchair, the right side being a mirror image thereof; and,

FIG. 6 is a bottom view of the armchair. 

CLAIM The ornamental design for an armchair, as shown and described. 